Metal form and form holder for concrete joist and slab construction



Jan. 13, 1931. I e. s. NELSON METAL FORM AND FORM HOLDER FOR CONCRETE JOIST AND SLAB COSTRUCTION Filed July 19. 1929 2 Sheets-Sheet 1 George 5.1% Zsow,

Jan. 13, 1931 G. S. NELSON METAL FORM AND FORM HOLDER FOR CONCRETE JOIST AND SLAB COSTRUCTION Fiied July 19. 1929 2 Sheets-Sheet 2 40 g Monica George SJWQ 1802:,

abtomq Pate ted-Jan. 13, 1931' 1: L

ED S ATES f enonen s. NELSON, or SALT LAKE crrir, mine; 7

I mn'rnii romvr AND roniu noLnER on. coNcRnErE JOIST AND s ILAB eons a nuo'rion L The present ginvention relates to;

ments in metal forms and for m holders for use in concrete jist:.and slabiconstructioni and has for a general objectthe provision fof forms requ ring a minimum of false work and wood-forming for support.

one of the difficulties encountered in" the use of metal forms'previously used has been the provision of means t'o support'jtheiforms in upright position'and .to support the s des 7 .of 'the form" where the sides are flexible.

Various constructions. have previously. been p A generalob'je'ct of the present invention is the provision of forms and form-holders by means of which the forms may be firmly.

' secured-improper position and-which may be readily assembled and taken .apartwith a minimum of'efli'ort'.

A further object" of the invention is 'the provision of forms-and form holders which' may be readily stacked for purposes of storage and shipment."

Still another' 'objectof the invention isthe' provision of forms andformholders of such construction that accurate-placing is'made certain even when manipulated by an un:

skilled laborer so that the molding of joists of varying depths is precluded.

These and other objects of the invention will become more readily apparent upon. a

study of the following specification when read in 7 connection with the accompanying drawings and .appendedclaims.

In thedrawings, Fig. 1 is a cross-sect onal.

' i '{Fig13 is-a sectional viewillustrating the method of forming drop ends. Fig. 4: is aside elevation of'a single 11116 Application filed iul y 19, 1929.' s eriallli'o 279.447.

of forms showingthe relative positions of the forms when :in placer. i i Fig. 5; is an end view rider-form; W A. V V V Fig. 6 is a side elevation'of whatgI' caH the saddle-form; T 7 p "Fig. 7 is an end view of'thesaddle form. Fig. 8 isa side elevation of therider'; form e Fig. 9 is 'afrontelevationof an end diaphragm which may jbeused in connection with the sacldle form. V

ofwhatI .cal l' th e'l F ig. 10 is a sideelevation of the end dia phragm shown :in' Fig. 9.. p

Fig. 11 isa plan view of the form holder with the wedge removed. I Fig. 12 isfa side'elevationfof the form holder with the'wedgein place.

Fig. 13 -'s an enlarged thewedge and link connection between the arms of the fform holdei-Qwhen thejform holderis in closed contracted position fp 14; is an enlarged sectional view of the wedge and link "connection between 1 the armsjof the form holder when the; form holder is .in closed expanded position.

Fig. 15- is'a cross-section through the sectional view fof e The rider 'form'2 is preferably made of V a single'fsheet of metal bent-intoany'desirg able shape such as that illustrated in Figs. 5 and 8. Each ,sidei of the rider form is provided'with a" plurality of vertically: spaced slots'or openings 6. The sidesA are sprung outwardlylso that in normal unrestrained conditiontheir position will be that indicated by the dotted lines 8 in Fig. The saddle form lQisl also preferably made of :a single sheet of inetalbut maybe built upof a plurality ofgpi'eces if desired. Each of theside's 12 of the saddle form is 'prefe'rably provided with: two sets? of 'Qvertically spaced slots I lfas shown; the? sets ifon' either side being disposed oppositelyv from'jthose' on the other side; one end of thesaddle form, the sides are provided with inwardly turned flanges 16 which extend' from substantially the bottom the sides to within" a spaced distance 18 from thetopjQOof the saddle form; An end diaphragm 22 is pro,

outer extremities. 7 between the bentportions 32 of the arms vided for the purpose of closing off the flanged end of the saddle form. The end diaphragm consists simply of a metal plate having one end bent as shown at 24in Fig. 10, leaving a face portion 25 and a bent portion 27.

The form holder 26 which is illustrated V in Figs. 11 to-l5 will forconvenience first be described per se and its relation to the forms discussed, subsequently. The form holder consists of two. arms 28 which are preferably made of fiat strips of metal.

One end of each of the arms is bent slightly more thanninety degrees as at30 leavingbent portions 32. The extremities-of the bent portions are turned about opposite sides of a rectangular 'shapedlink 34 at 36. Each ofthe arms isprovided with a slot. 38 at a spaced distance from its outer extremity,-

leavingportions 40 between the slots and Adapted to be inserted is a wedge/42 which is held against upward movement by means of teeth 44, punched vthe arms further apart.

In the actual process of forming a con-- crete' slab and joist floor the 'falseuvork con? sisting of the soffits 46 and 48 is first set inplaee and supported at intervals bythe necessary beams and posts. "The. falsework is of course of rough construction but the solhts are positioned at spaced intervals 00 1- forming as nearly as possible to-the width.

of the saddle and rider forms to be; used.

After the false work has been completed I the forms 'aree'mounted on the .sofiits by means of theform holders as illustratedqin Figs. 1 to 4. In mounting the f'orms, the

portions 40 of the arms of the form holder are inserted through oppositely disposed slots in the sides of the form desired to. be mounted until each of the slots 38 is in alignment with its particular side of the form. The entire form holder is thendiss placed laterally until the ends'of the slots 38 engage the ends of the slots 6, 01114 in the sides of the form thus locking'the sides against longitudinal movement with respect to the arms. At this stage the steel forms are placed on the soffit forms with their bot.- tom edges resting on the false work... By pulling down'onthe form holder, thesides of the form will "be drawn together and will drop along the inner sides of the soflits.

upon which the. form is being mounted.

The pr j cti g portions 4 o the arm 2.

will engage the tops of the sofiits however,

and support the form; The form is now in place and the form holder is in open position. An illustration of this is shown in the right hand side of Fig. 1.

In order to lock the form into proper place it is now only necessary to insert the wedge 42 the proper depth and then to push the center of the form holder upward intoclosed position. Due to possible variations .in thespacingof thesoffits, one or two trials may be required before the wedge is inserted at j ust theproper depth but in any case a tight fitis insured. When the form holder is pushed upwardly the sides of the form will be pushed outwardly so that their lower edges will press tightly against the inner sides of the .soflits, thus preventing the flow ofmateriallbetweenthe two and the portions 40 of the arms 28 will be brought to rest horizontally on th COPS of the soflits thereby providing a secure support. as shown intheleft hand side ofvFig. 1. In

the course of this operation, thefbent portions. 82 of the arms 28 will be slightly sprungbut'this spring action will hold the.

form holder in'closed position until its re.- moval is desired. The teeth 44 also act to prevent the wedge from slipping, thereby assistin in holding the holder in closed position. Where additional security is desired against any danger of the form holder falling out of closed position, one or two strands of wire may be wound about the 32 near the bends 30. I 7

The removal of the form is accomplished portions by simply pulling downward on the tool holder. In this operation the portions 40 of the respective arms28 of the holder are drawntogether sufliciently toallowl downwardpassage between the sofiit forms. [Due to the notches 38 the sides of the form are consequently also drawn togetherso that the entire formis free to drop downbetween the sofiit forms and .isreadyfor use elsewhere.

The removal-of. the forms does not disturb the false workwhich may be allowed to remain'until the concrete has sufliciently set.

Due to the provision of the vertically spaced sets of slots in the sides of the forms, the forms may beheld "any desireddistance above the sofiit forms so as to mold a joist ofproper depth. The utility of this is evident from the showing in Fig. 3, for example, where steel forms of the same height are used in the forming of droa'ends by simply inserting the form hol er of the lower. form into higher-slots than those engagedby the'form holder of the higher form. i I The saddle forms only may be used for forming ends and bridging asshown in Fig.

2. For all other purposes the rider form can be used but in actual construction work t'hasbeen found mast ad ant g s t0 us Ail) the saddle and rider forms alternately. In a V Z practical building operation saddle forms are their form holders in open position.

placed on the sofi'its at spaced intervals with The spaces between the saddle forms are then covered by resting rider forms over the ends of the saddle forms as shownin Fig. 4 after which the form holders of the saddle forms are moved into closed position. Thus in ordinary cases it will not be necessary'to apply form holders to the rider forms'but this may be done if required in order to effect proper rigidity when there is a heavy load, for example. In general practice but one form holder for the rider forms provides sufficient rigidity and support and I therefore provide these forms with but one set of substantially centrally located slots although as many sets of slots and as many form holders may be used for each form as desired. The saddle forms should preferably be provided with two sets of slots and two form holders. g t

hen it is desired to'use the saddle form for forming ends and bridging as'shown in Figs. 2 and 3 it isonly necessary to apply an end diaphragm to the flanged end. This is accomplished by simply inserting the bent portion 27 of the diaphragm into the spaces 18 between the top of the form and the upper ends of the flange 16, allowing the face portion 25 to extend downwardly and cover. the end of the form. No nuts, bolts or other connections are required. When the concrete is poured its weight will bear against the face of the end diaphragm pressing it tightly against the outer flat surfaces of the'fianges 16 so that a tightfit is in: sured and no concrete will leak through the form.

Having thus described my invention what Inow claim as new anddesire to secure by :Letters Patent of the United States is as follows:

1. A metal form for use in concrete construction in which false work is used havlng I r a top, and flexible sides provided with oppositely disposed openings therein, a form holder comprising two spaced arms plvotally connected to a central. link, said form holder projecting through 'two of said oppositely disposed openings in the sides of the form at each end, means for locking the sides of the 7 metal form against longitudinal movement withrespect to the arms of the form holder at the point of passage of the arms through the sides at the openings therein, and means for varying the space between the two arms, the said portions of the arms projecting through the openings in the sides being adapted to support the form from the false work. g

' 2. A metal form for use in concrete joist and slab construction inwhich false work is used having a top, and sides provided with oppositely"dtisposedopenings therein, an

wardl'y turnedflang'e's projecting from the sides at one end of the form,- an end dia' I phragh'i 'covjering the aforesaid flanged end i of the-form, a" forni"'holder comprising tw'o through the openingsin the sides bein fl adapted to support the form from the false work.

and slab construction having a -top an d sides, inwardly turned flanges projecting 3. A metal'formtfon use in concrete joist I from" the sides at one end of the'fo'rm and" extending from substantially "the bottom of the sides to within a spaced distancefrom the top, an 5 end' diaphragm comprising a my f main flat portion and a bentportion at' one" end, said bent portion "of the diaphragm" being adapted to be'inserted atoneiendof the metal form inthe spacebetw'een"their aforesaid flanges and' 'the top of 'the form, the main flatportion being adapted tojcov'er,

the flanged end, emanates for supporting the form andfor holding the sides in extended position.

4.A metal form for concrete construction having a top and sides" provided with oppositely disposedv openings a form holder comprislng two arms connected to a rectangulari link, each of .said arms projecting through one of the aforesaid openings, means'for locking the sides against movement longitudinally of the arms, and

wedge between said arms at the link connection for locking said arms against rela--- tive angular movementfland for adjusting the length of the form holder. 5. A form holder for metal forms use in concrete construction, comprising two arms eachhaving an end bent slightly more than ninety degrees, a rectangularlink connecting said arms at the extremities of their bent portions, and-a wedge adapted to be inserted between said bent portions and through said link, each of said arms havj ing. notches in their sides at spaced distances from their free ends. i C

. 6. A metal form for concrete construction having a top'and sides provided with oppositely disposed vertically spaced open j ings, said sides having inwardly turned flangesextending to within a spaced distance fromythe top of the format one end of said form, and an end diaphragm for covering the flanged end of'said form, saidend diaphragm having an upper bent portion adapted to be inserted in the'spagebe: u e flanges an the.

tween the inwardly topof the form, in i '7. A metal form for concrete construction having a top and depending sides subjsta-ne tially at right angles thereto, said sides having inwardly turned flanges terminating at a spaced distance from the top, and an end diaphragm comprising a main flat portion having abent edge portion, said bent edge;

portion resting on the upper extremities of the side flanges whereby the main fiat portion covers the space between the two flange sides.-

8. A metal form for use in concrete construction in which false work is used hav- 7 ing a top andsides, and a detachable form holder comprising two pivotally connected arms having free ends engaging the sides of the metal form to' hold them firmly against the false work, means for locking said arms in their relative angular positions when holding themetal form firmly against the false work, and means'for varying the relative longitudinal positions of said arms thereby to vary the distance between the T ends thereof engaging the sides of the metal form when said arms are in their aforemen- ,tioned relative'angular positions.

In testimony whereof I have hereunto set my signature. 7 ,7

, GEORGE S. NELSON. 

